Multilayer coating film and coated article

Patent metadata

Field	Value
Publication number	US-10899118-B2
Application number	US-201616087436-A
Country	US
Kind code	B2
Filing date	Sep 30, 2016
Priority date	Sep 30, 2016
Publication date	Jan 26, 2021
Grant date	Jan 26, 2021

Abstract

FF properties of a multilayer coating film configured to exhibit a warm color through a lustrous layer ( 14 ) and a translucent colored layer ( 15 ) are improved to achieve a metallic textured color having a high-quality color tone. The lustrous layer ( 14 ) is configured such that Y(10°) is 50 or more and 950 or less and that Y(25°) is 0.05 or more and 0.35 or less times the Y(10°), where Y(10°) represents a Y value, of an XYZ color system, of reflected light measured at a light receiving angle of 10° and Y(25°) represents a Y value of the reflected light measured at the light receiving angle of 25° in a case where a light incident angle is 45°. A concentration C of a warm color pigment of the colored layer ( 15 ) is 1% by mass or more and 17% by mass or less.

First claim

The invention claimed is:

1. A multilayer coating film, comprising:
a lustrous layer containing a luster material and formed directly or indirectly on a surface of a coating target; and
a colored layer which is translucent, containing a warm color pigment, and layered on the lustrous layer, wherein
the lustrous layer contains, as the luster material, high-reflection flakes and low-reflection flakes,
the high-reflection flakes are aluminum flakes,
the low-reflection flakes are chrome oxide flakes or carbon flakes,
regarding a Y value of an XYZ color system, the Y value being calibrated by a standard white plate, the lustrous layer satisfies the following:
Y(10°) is 50 or more and 950 or less;
Y(25°)=k×Y(10°) (where k is a coefficient); and
k is 0.05 or more and 0.35 or less,
where Y(10°) represents a Y value of reflected light measured at a light receiving angle of 10° (a tilt angle toward a light source from a specular reflection angle) and Y(25°) represents a Y value of reflected light measured at a light receiving angle of 25° in a case where a light incident angle is 45° (an angle tilted 45 degrees from a normal to a surface of the lustrous layer), and
a concentration C of the warm color pigment of the colored layer is 2% by mass or more and 16% by mass or less.

2. The multilayer coating film of claim 1 , wherein
a mean value of reflectances of the lustrous layer which are measured at the light receiving angle of 110° in the case of the light incident angle of 45° within a wavelength range of between 450 nm and 700 nm is set to be 0.003 or more and 0.045 or less, defined as an absolute value, with respect to a reflectance of the standard white plate.

3. The multilayer coating film of claim 2 , wherein the lustrous layer contains a pigment having a hue similar to a hue of the colored layer.

4. The multilayer coating film of claim 1 , wherein
the colored layer contains a reddish pigment as the pigment, and
an inclination of a tangent to a spectrum of a spectral transmittance, defined as an absolute value, of the colored layer at the wavelength of 620 nm is 0.012 nm −1 or more and 0.03 nm −1 or less, the spectral transmittance being obtainable by dividing a spectral reflectance measured for the colored layer stacked on the lustrous layer at the light receiving angle of 25° in the case of the light incident angle of 45°, by a spectral reflectance measured for the lustrous layer from which the colored layer is removed and a surface of which is therefore exposed, at the light receiving angle of 25° in the case of the light incident angle of 45°.

5. The multilayer coating film of claim 4 , wherein
a mean particle size of the reddish pigment is 2 nm or more and 160 nm or less.

6. The multilayer coating film of claim 1 , wherein
the aluminum flake has a particle size of 5 μm or more and 15 μm or less, a thickness of 20 nm or more and 200 nm or less, and a surface roughness Ra of 100 nm or less, and
a percentage of the aluminum flake to a resin contained in the lustrous layer is 8% by mass or more and 20% by mass or less.

7. A coated object having the multilayer coating film of claim 1 .

Assignees

• Mazda Motor

Inventors

• Yamane Takakazu
• Okamoto Keiichi
• Teramoto Kouji
• Nonaka Ryuji

Classifications

• B05D7/53 Primary

  Base coat plus clear coat type · CPC title

• B05D5/06

  to obtain multicolour or other optical effects (B05D5/02 takes precedence) · CPC title

• B32B2307/4026

  within the layer by addition of a colorant, e.g. pigments, dyes · CPC title

• B32B2307/414

  Translucent · CPC title

• B05D7/14

  to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23) · CPC title